Digital Commons Network^™

The Effect Of Vibratory Milling On The Powder Properties Of Zinc Oxide Varistors, Maura Kelleher, M.S.J. Hashmi

Articles

The formation of powders from multi-elemental oxides for the subsequent formation of a green and sintered compact body is a major processing operation in the manufacture of ZnO varistors. The physical and chemical properties of the metal oxides are crucial not only for the formation of a varistor component with optimum microstructure and thus electrical characteristics but also for avoiding the introduction of flaws and reduced yield during subsequent manufacturing stages. The effect of vibratory milling using cylindrical zirconia media on the physical and chemical properties of the mixed multi-elemental oxide additives of a commercial ZnO varistor formulation was studied. …

Implementing Few-Body Algorithmic Regularization With Post-Newtonian Terms, Seppo Mikkola, David Merritt

Articles

We discuss the implementation of a new regular algorithm for simulation of the gravitational few-body problem. The algorithm uses components from earlier methods, including the chain structure, the logarithmic Hamiltonian, and the time-transformed leapfrog. The code can be used for the normal N-body problem, as well as for problems with softened potentials and/or with velocity-dependent external perturbations, including post-Newtonian terms, which we include up to order PN2.5. Arbitarily extreme mass ratios are allowed. Coordinate transformations are not used and thus the algorithm is somewhat simpler than many earlier regularized schemes. We present the results of performance tests, then use our …

Ejection Of Supermassive Black Holes From Galaxy Cores, Alessia Gualandris, David Merritt

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Recent numerical relativity simulations have shown that the emission of gravitational waves during the merger of two supermassive black holes (SMBHs) delivers a kick to the final hole, with a magnitude as large as 4000kms-1. We study the motion of SMBHs ejected from galaxy cores by such kicks and the effects on the stellar distribution using high-accuracy direct N-body simulations. Following the kick, the motion of the SMBH exhibits three distinct phases. (1) The SMBH oscillates with decreasing amplitude, losing energy via dynamical friction each time it passes through the core. Chandrasekhar’s theory accurately reproduces the motion of the SMBH …

Towards A Model Of Critical Ethics To Inform The Research Process In Postgraduate Research, Aidan Kenny

Articles

The ethics narrative has become embedded in the contemporary research process, as evident in the emergence of Ethical Committees in faculty and both public and private organisations. Ethics have been codified, made visible and accessible as text artefacts in the forms of (both voluntary and regulatory) codes, statements, conventions, guidelines, principles, procedures, practices. In this short paper I explore this codification of ethics from the period post WWII, detailing some of the milestone text artefacts.

The Anti-Microbial Efficacy Of Plant Essential Oil Combinations And Interactions With Food Ingredients, Jorge Gutierrez, Catherine Barry-Ryan, Paula Bourke

Articles

The objective of this study was to evaluate the efficacy of plant essential oils (EOs) in combination and to investigate the effect of food ingredients on their efficacy. The EOs assessed in combination included basil, lemon balm, marjoram, oregano, rosemary, sage and thyme. Combinations of EOs were initially screened against Bacillus cereus, Escherichia coli, Listeria monocytogenes and Pseudomonas aeruginosa using the spot-on-agar test. The influence of varying concentrations of EO combinations on efficacy was also monitored using E. coli. These preliminary studies showed promising results for oregano in combination with basil, thyme or marjoram. The checkerboard method was then used …

The Interface Between Academic Knowledge And Working Knowledge: Implications For Curriculum Design And Pedagogic Practice, Anne Murphy

Articles

This paper considers some aspects of the theory and practice of work-based learning (WBL) that may be of interest to academic staff in higher education who have responsibility for negotiating, designing, delivering and assessing programmes for, and with, Irish workplaces, companies, organisations and sectors of the workforce. The paper does not claim to be breaking significant new ground: rather it is trying to connect aspects of the field to inform underpinning of WBL curriculum design and related pedagogic practice as the start of a conversation rather than the last word.

The Effect Of Radiation Pressure On Virial Black Hole Mass Estimates And The Case Of Narrow-Line Seyfert 1 Galaxies, Alessandro Marconi, David J. Axon, Roberto Maiolino, Tohru Nagao, Guia Pastorini, Paola Pietrini, Andew Robinson, Guidetta Torricelli

Articles

We consider the effect of radiation pressure from ionizing photons on black hole (BH) mass estimates based on the application of the virial theorem to broad emission lines in AGN spectra. BH masses based only on the virial product V2R and neglecting the effect of radiation pressure can be severely underestimated especially in objects close to the Eddington limit. We provide an empirical calibration of the correction for radiation pressure and we show that it is consistent with a simple physical model in which BLR clouds are optically thick to ionizing radiation and have average column densities of NH ∼ …

Discourse Analysis As An Approach To Intercultural Competence In The Advanced Efl Classroom, Sue Norton

Articles

In 1991 Michael McCarthy wrote in his Preface to Discourse Analysis for Language Teachers that discourse analysis is ‘not a method of teaching languages; it is a way of describing and understanding how language is used’. By 1994 he had reformulated his position and, with Ronald Carter, published Language as Discourse: Perspectives for Language Teaching, which argued in favour of providing students with a metalanguage by which to analyse the language they were learning. These days, owing to the work of McCarthy, Carter, and others, the basics of discourse analysis can indeed comprise an appropriate subject matter for the advanced …

Real-Time Plasma Controlled Chemistry In A Two-Frequency, Confined Plasma Etcher, Vladimir Milosavljevic, Albert R. Ellingboe, Cezar Gaman, John V. Ringwood

Articles

The physics issues of developing model-based control of plasma etching are presented. A novel methodology for incorporating real-time model-based control of plasma processing systems is developed. The methodology is developed for control of two dependent variables (ion flux and chemical densities) by two independent controls (27 MHz power and O2flow). A phenomenological physics model of the nonlinear coupling between the independent controls and the dependent variables of the plasma is presented. By using a design of experiment, the functional dependencies of the response surface are determined. In conjunction with the physical model, the dependencies are used to deconvolve the sensor …

Administration Of Territories By The United Nations: Is There Room For International Humanitarian Law?, Steven R. Ratner

Articles

The fundamental starting point of this conference is that peace operations represent a challenge to the implementation of international humanitarian law (IHL) for the simple reason that IHL was developed for states conducting hostile military operations against other states or non state actors.

Administration of territories represents one subset of peace operations – continuation of second-generation peacekeeping (PK) where parties, typically prodded by outsiders, formally delegate to the United Nations (UN) authority for the implementation of a peace agreement – though it has also been extended to situations where final status and outcome are not sure, as with East Timor …

Art In The Life World, Review, Niamh Ann Kelly

Articles

No abstract provided.

Teaching Ip From An Entrepreneurial Counseling And Transactional Perspective, Sean M. O'Connor

Articles

The traditional law school appellate case method is not well-suited to teaching students either the substance and process of counseling entrepreneurial clients or helping such clients create IP strategies that effectively advance their business vision. This Article describes the author’s creation of new courses and clinics to advance teaching IP in the emerging field of entrepreneurship and innovation law

Wfpc2 Lrf Imaging Of Emission Line Nebulae In 3cr Radio Galaxies, G. C. Privon, Christopher P. O'Dea, Stefi A. Baum, David J. Axom, P. Kharb, C. L. Buchanan, W. Sparks, M. Chiaberge

Articles

We present HST/WFPC2 Linear Ramp Filter images of high surface brightness emission lines (either [OII], [OIII], or H +[NII]) in 80 3CR radio sources. We overlay the emission line images on high resolution VLA radio images (eight of which are new reductions of archival data) in order to examine the spatial relationship between the optical and radio emission. We confirm that the radio and optical emission line structures are consistent with weak alignment at low redshift (z < 0.6) except in the Compact Steep Spectrum (CSS) radio galaxies where both the radio source and the emission line nebulae are on galactic scales and strong alignment is seen at all redshifts. There are weak trends for the aligned emission line nebulae to be more luminous, and for the emission line nebula size to increase with redshift and/or radio power. The combination of these results suggests that there is a limited but real capacity for the radio source to influence the properties of the emission line nebulae at these low redshifts (z < 0.6). Our results are consistent with previous suggestions that both mechanical and radiant energy are responsible for generating alignment between the radio source and emission line gas.

Leaving More Than Money: Mediation Clauses In Estate Planning Documents, Lela P. Love, Stewart E. Sterk

Articles

When probate disputes arise, an increasing number of courts have been referring those disputes to mediation. Estate planners, however, have been less proactive about drafting wills to include mediation clauses that would anticipate estate disputes and channel them away from litigation. When a will mandates mediation, the will provides a dispute resolution mechanism designed to preserve family harmony, conserve estate assets, and avoid airing the family's "dirty laundry "-objectives common to many testator. Mediation clauses in wills are no panacea. They are of little value to testators who exalt control over estate assets above all other concerns, and they are …

Hyperfast Pulsars As The Remnants Of Massive Stars Ejected From Young Star Clusters, Vasilii Gvaramadze, Alessia Gualandris, Simon P. Zwart

Articles

Recent proper motion and parallax measurements for the pulsar PSR B1508+55 indicate a transverse velocity of 1 100 kms−1, which exceeds earlier measurements for any neutron star. The spin-down characteristics of PSR B1508+55 are typical for a non-recycled pulsar, which implies that the velocity of the pulsar cannot have originated from the second supernova disruption of a massive binary system. The high velocity of PSR B1508+55 can be accounted for by assuming that it received a kick at birth or that the neutron star was accelerated after its formation in the supernova explosion. We propose an explanation for the origin …

Treg Depletion Inhibits Efficacy Of Cancer Immunotherapy: Implications For Clinical Trials., James Curtin, Marianela Candolfi, Tamer Fakhouri, Chunyan Liu, Anderson Alden, Matthew Edwards, Pedro Lowenstein, Maria Castro

Articles

BACKGROUND: Regulatory T lymphocytes (Treg) infiltrate human glioblastoma (GBM); are involved in tumor progression and correlate with tumor grade. Transient elimination of Tregs using CD25 depleting antibodies (PC61) has been found to mediate GBM regression in preclinical models of brain tumors. Clinical trials that combine Treg depletion with tumor vaccination are underway to determine whether transient Treg depletion can enhance anti-tumor immune responses and improve long term survival in cancer patients. FINDINGS: Using a syngeneic intracrabial glioblastoma (GBM) mouse model we show that systemic depletion of Tregs 15 days after tumor implantation using PC61 resulted in a decrease in Tregs …

The Subaru/Xmm-Newton Deep Survey (Sxds) - V. Optically Faint Variable Object Survey, Tomoki Morokuma, Mamoru Doi, Naoki Yasuda, Michael Richmond, Et Al.

Articles

We present our survey for optically faint variable objects using multi-epoch (8−10 epochs over 2−4 years) i′-band imaging data obtained with Subaru Suprime-Cam over 0.918 deg2 in the Subaru/XMMNewton Deep Field (SXDF). We found 1040 optically variable objects by image subtraction for all the combinations of images at different epochs. This is the first statistical sample of variable objects at depths achieved with 8-10m class telescopes or HST. The detection limit for variable components is i′ vari 25.5 mag. These variable objects were classified into variable stars, supernovae (SNe), and active galactic nuclei (AGN), based on the optical morphologies, magnitudes, …

Design Of A Multiple Component Geometric Breast Phantom, Karl G. Baum, Kevin Mcnamara, María Helguera

Articles

The quality and realism of simulated images is currently limited by the quality of the digital phantoms used for the simulations. The transition from simple raster based phantoms to more detailed geometric (mesh) based phantoms has the potential to increase the usefulness of the simulated data. A preliminary breast phantom which contains 12 distinct tissue classes along with the tissue properties necessary for the simulation of dynamic positron emission tomography scans was created (activity and attenuation). The phantom contains multiple components which can be separately manipulated, utilizing geometric transformations, to represent populations or a single individual being imaged in multiple …

The Origin Of The Infrared Emission In Radio Galaxies. I. New Mid- To Far-Infrared And Radio Observations Of The 2 Jy Sample, D. Dicken, Clive Tadhunter, Raffaella Morganti, C. Buchanan, T. Oosterloo, David J. Axon

Articles

As part of a large study to investigate the nature of the longer wavelength continuum emission of radio-loud AGN, we present new mid to far-infrared (MFIR) and high frequency radio observations for a complete sample of 2Jy powerful, southern radio galaxies at intermediate redshifts (0.05 < z < 0.7). Utilizing the sensitivity of the Spitzer Space Telescope, we have made deep MIPS observations at the wavelengths of 24, 70 and 160μm, detecting 100% of our sample at 24μm and 90% at 70μm. This high detection rate at MFIR wavelengths is unparallelled in samples of intermediate redshift radio galaxies. Complementing these results, we also present new high frequency observations (15 to 24Ghz) from the Australia Telescope Compact Array (ATCA) and the Very Large Array (VLA), which are used to investigate the potential contamination of the MFIR continuum by non-thermal synchrotron emission. With the latter observations we detect the compact cores in 59% of our complete sample, and deduce that non-thermal contamination of the MFIR continuum is significant in a maximum of 30% of our total sample. MFIR fluxes, radio fluxes and spectral energy distributions for the complete sample are presented here, while in a second paper we will analyse these data and discuss the implications for our understanding of the heating mechanism for the warm/cool dust, star formation in the host galaxies, and the unified schemes for powerful radio sources.

The Roberts Court, Stare Decisis, And The Future Of Constitutional Law, Geoffrey R. Stone

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No abstract provided.

Further Insight Into Gravitational Recoil, Carlos O. Lousto, Yosef Zlochower

Articles

We test the accuracy of our recently proposed empirical formula to model the recoil velocity imparted to the merger remnant of spinning, unequal-mass black-hole binaries. We study three families of black-hole binary configurations, all with mass ratio q=3/8 (to maximize the unequal-mass contribution to the kick) and spins aligned (or counter aligned) with the orbital angular momentum, two with spin configurations chosen to minimize the spin-induced tangential and radial accelerations of the trajectories respectively, and a third family where the trajectories are significantly altered by spin-orbit coupling. We find good agreement between the measured and predicted recoil velocities for the …

On The Onset Of Runaway Stellar Collisions In Dense Star Clusters - I. Dynamics Of The First Collision, Evghenii Gaburov, Alessia Gualandris, Simon P. Zwart

Articles

We study the circumstances under which first collisions occur in young and dense star clusters. The initial conditions for our direct N-body simulations are chosen such that the clusters experience core collapse within a few million years, before the most massive stars have left the main-sequence. It turns out that the first collision is typically driven by the most massive stars in the cluster. Upon arrival in the cluster core, by dynamical friction, massive stars tend to form binaries. The enhanced cross section of the binary compared to a single star causes other stars to engage the binary. A collision …

Plane Decompositions As Tools For Approximation, Melanie J. Agnew, Christopher M. Homan

Articles

Tree decompositions were developed by Robertson and Seymour [21]. Since then algorithms have been developed to solve intractable problems efficiently for graphs of bounded tree width. In this paper we extend tree decompositions to allow cycles to exist in the decomposition graph; we call these new decompositions plane decompositions because we require that the decomposition graph be planar. First, we give some background material about tree decompositions and an overview of algorithms both for decompositions and for approximations of planar graphs. Then, we give our plane decomposition definition and an algorithm that uses this decomposition to approximate the size of …

Macroeconomic Policy Change: Ireland In Comparative Perspective, John Hogan

Articles

This paper sets out to develop an improved framework for examining critical junctures. This a priori framework is a significant improvement over existing critical juncture frameworks that lack any predictive element. It is an advance for historical institutionalism in particular, and political science in general. After the new framework is set out in detail here, it is tested. The framework is used to examine a number of potential critical junctures in macroeconomic policy, drawn from Ireland, Sweden, Britain, and America in the latter half of the twentieth century

Foundations Of Multiple Black Hole Evolutions, Carlos O. Lousto, Yosef Zlochower

Articles

We present techniques for long-term, stable, and accurate evolutions of multiple-black-hole spacetimes using the ‘moving puncture’ approach with fourth- and eighth-order finite difference stencils. We use these techniques to explore configurations of three black holes in a hierarchical system consisting of a third black hole approaching a quasi-circular black-hole binary, and find that, depending on the size of the binary, the resulting encounter may lead to a prompt merger of all three black holes, production of a highly elliptical binary (with the third black hole remaining unbound), or disruption of the binary (leading to three free black holes). We also …

An Fio Calculus For Marine Seismic Imaging: Folds And Cross Caps, Raluca Felea, Allan Greenleaf

Articles

We consider a linearized inverse problem, arising in offshore seismic exploration, for an isotropic wave equation with sound speed assumed to be a small, singular perturbation of a smooth background. Under an assumption of at most fold caustics for the background, we identify the geometry of the canonical relation underlying the linearization, F, which is a Fourier integral operator, and establish a composition calculus sufficient to describe the normal operator F^*F. The resulting artifacts are 1/2 derivative smoother than in the case of a single-source seismic experiment. Refer to PDF file for exact formula.)

Exploring An Inverted U-Shaped Relationship Between Entrepreneurial Orientation And Performance In Chinese Ventures, Jintong Tang, Zhi Tang, Louis Marino

Articles

The critical role of entrepreneurial orientation (EO) in firm performance has been widely studied in the U.S. context. However, the examination of this key construct in emerging regions such as China has been very limited. In this article, we hypothesize that the relationship between EO and firm performance is best represented as curvilinear, as opposed to linear, in China. We use a two-study approach to test the link between EO and performance, as expressed in both perceptual and objective performance. Findings of both studies demonstrate an inverted U-shape relationship. Implications for future research on EO are discussed.

Entrepreneurial Network Development: Trusting In The Process, Delmonize Smith, Franz Lohrke

Articles

An entrepreneur's network can provide a significant source of social capital, which, in turn may increase a new venture's likelihood of success. Entrepreneurship research has frequently examined how such networks develop, and reviewing extant studies suggests that trust plays a significant role in this process. Despite its recognized importance, limited research exists examining how trust evolves during and interacts with the entrepreneur's venture network development. Accordingly, we propose that an entrepreneur's reliance on exchange relationships based on model's implications and future research avenues.

A Case For A Parallelizable Hash, Alan Kaminsky, Stanisław Radziszowski

Articles

On November 2, 2007, NIST (United States National Institute of Standards and Technology) announced an initiative to design a new secure hash function for this century, to be called SHA-3. The competition will be open and it is planned to conclude in 2012. These developments are quite similar to the recent history of symmetric block ciphers— breaking of the DES (Data Encryption Standard) and emergence of the AES (Advanced Encryption Standard) in 2001 as the winner of a multi year NIST competition. In this paper we make a case that parallelizability should be one of the properties sought in the …

Throttle Icing: Understanding The Icing Mechanism And Effects Of Various Throttle Features, Julie M. Galante-Fox, Donald E. Jarvis, Robert D. Garrick

Articles

Some Electronic Throttle Control (ETC) Air Control Valves (ACV) on automotive internal combustion engines are susceptible to icing of the throttle valve. Ice formation can result in an increase in torque required to open or close the valve. Laboratory studies were conducted to improve the understanding of throttle valve icing on electronic throttle control valves with both aluminum and composite (plastic) bodies over various bore sizes (4 cylinder to 8 cylinder engines). Study results indicated that ice compression at the bore and valve gap, not ice adhesion, is the major contributor to the ETC-ACV icing phenomenon. In addition, testing of …